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What do the following all have in common?
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



Dozen
Couple
Few
Baker’s Dozen
Ten

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Mole- counting unit standing for 6.02 x 1023
particles
Tells us how many particles of a compound
are actually involved in a reaction
1 mole = 6.02 x 1023 particles
602,000,000,000,000,000,000,000 particles
Avogadro’s Number

1 mole of water = how many particles?

1 mole of sugar = how many particles

6.02 x 1023 particles = how many moles?

A dozen eggs would make a HUGE omelet!

A mole of eggs would make an omelet big
enough to cover the Earth thirty times!

Atoms and Molecules are TINY!

A drop of water contains 10 trillion water
particles!

6.02 x 1023 makes a chemist’s life a lot easier

It’s impossible to keep track of one atom
 so scientist discovered this number that gives us
the molar mass of an atom

Molar mass is the mass of 6.02 x 1023 particles
of a given substance
 Mass is given in grams

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We don’t always have exactly 1 mole, though.
When we have different amounts of moles, we can
convert between atoms and moles
Multiply by Avogadro’s Number
Moles
Particles
Divide by Avogadro’s Number


A lab experiment calls for 2.00 moles of
Calcium. How many particles of Calcium are
required?
How can we solve this?
 Dimensional Analysis!
▪ ID what we’re given and what the question’s asking for
and set up the T-Chart
23
2 moles Calcium 6.02 x 10 particles
1 mole Calcium

You have 12.04x1023 atoms of sulfur. How
many moles of sulfur do you have?


Molar Mass = the mass of 1 mole of a substance
Tells us what mass of a substance is used in a
reaction
Molar mass: mass of 1 mole of
in grams
1 mole C atoms = ___________ particles
1 mole of C atoms has a molar mass of_________ g.
Molar mass of O = ___________
Molar mass of Li = ____________
For any element, the
Molar Mass = Mass Number
3.2
What is the mass of one mole of:
S
C
Hg
Cu
Fe
3.2
Count out the atoms in the
compound
2) Look up the Molar Mass for each
element
3) Multiply the Molar Mass of each
element by the # present in the
compound
4) Sum the Molar Masses
1)

No more than 4 at a station

10 min at each station max

If completed before 10 min is up, check
answers up at the front

Use your station buddies for help before asking
Ms. Herndon!

NO2
 SO2

C6H12O6

(NH4)3PO4
1)
2)
How many particles are in a mole?
Determine the Molar Mass for the following
problems. Don’t forget your UNITS!
a. Helium (He)
b. KCl4
c. Cu(OH)2

If I had 20 Dollars, and the cost of one pair of
kicks is 4 dollars for 1 pair, how many pairs
could I have?
What’s my conversion factor?
What unit am I given?
What unit is the question asking for?
20 Dollars
1 pair
4 Dollars
Now...
(20/4) pairs
5 pairs

If I had 20 grams of helium, and one mole of
helium is 4 grams, how many moles of helium
could I have?
What’s my conversion factor?
What unit am I given?
What unit is the question asking for?
20 grams He 1 mole He
4 grams He
(20/4) moles He
5 moles He